Casa Rosada, or Pink House is located on the Eastern side of Plaza de Mayo. The house owes its name to the representative color of its façade. The house belongs to the Argentine President’s offices, while The Casa Rosada Museum is located behind the building. In 1952, Eva Perón addressed her supporters in Plaza de Mayo from the balcony of the house. During weekends the house holds free guided tours that can be booked online. 

The Cabildo de Buenos Aires was the site of Spain's colonial administration in the city. Originally constructed from adobe and thatch in 1580, the current building was constructed over the second half of the 18th century, witnessed the Argentine Revolution in 1810, and served as an important administrative building during the first century of Argentine independence. 

The building now houses the National Museum of the Cabildo and the May Revolution, and displays original artefacts and documents as well as interactive exhibits on the Spanish colonial era, the British invasions of 1806 and 1807, and the early days of independence. The museum was rennovated in 2016, and now includes access to the former jail and more historic documents.